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The biggest phrase I've heard in the vein of #3 is, "maybe the extra CO2 will stimulate plant growth. Well, if that was true, the plants would grow, and the CO2 would be taken up...right? So, how come the CO2 levels aren't dropping?
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There is a time delay to the reaction.
dplantlife/dt = constant*CO2density + a whole lot of other factors
dCO2/dt = constant*plantlife + humanCO2 emmission + naturalCO2 emmission
I still say that due to the miniscule amount of human CO2 production to natural CO2 production, whether or not the luddites win and we stop (and civilization conseuently collapses), or the industrialists win and we keep producing CO2 will not matter in terms of global warming.